Stockholders' Equity (Share Repurchase Programs) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Increase (Decrease) in Common Stock Shares Outstanding [Roll Forward]
Common stock shares outstanding, ending balance	237,100,000	237,800,000
Common Stock
Increase (Decrease) in Common Stock Shares Outstanding [Roll Forward]
Common stock shares outstanding, beginning balance	286,318,000	286,318,000	286,318,000
Stock awards
Treasury stock purchases
Net stock purchased (sold) from employee benefit trust
Common stock shares outstanding, ending balance	286,318,000	286,318,000	286,318,000
Common Stock Held in Employee Benefit Trust
Increase (Decrease) in Common Stock Shares Outstanding [Roll Forward]
Common stock shares outstanding, beginning balance	169,000	132,000	248,000
Stock awards
Treasury stock purchases
Net stock purchased (sold) from employee benefit trust	27,000	37,000	(116,000)
Common stock shares outstanding, ending balance	196,000	169,000	132,000
Common Stock Held in Treasury
Increase (Decrease) in Common Stock Shares Outstanding [Roll Forward]
Common stock shares outstanding, beginning balance	48,316,000	46,545,000	42,411,000
Stock awards	(1,393,000)	(975,000)	(1,670,000)
Treasury stock purchases	2,138,000	2,746,000	5,804,000
Net stock purchased (sold) from employee benefit trust
Common stock shares outstanding, ending balance	49,061,000	48,316,000	46,545,000